Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Freight-Car Loadings, by Classes," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "October 1931," Federal Reserve Bulletin (October 1931) : 23-23. https://fraser.stlouisfed.org/title/62/item/20718/toc/313939 , accessed on April 18, 2024.